The third render of my latest project, the Talon Osiris heavy support mech.

Unit information:

Role: the Osiris is deigned to fulfill the role of a heavy support unit, with the ability to engage targets at any rage and the mobility to traverse terrain that would baffle wheeled or tracked vehicles.

As a long range artillery system, the legged chassis would be very useful to let it get into hard-reach places and help it defend itself, but 6 legs tend to be very power consuming. A 2 legged chassis would improve mobility and efficiency, and simply by having the vehicle deploy itself into a more stable posture before firing the main armament wouldn't make much of a tactical difference for its role.

The idea behind the Osiris was to make it a very heavy unit, supporting a very high-output power core to allow the 6 legged design to move. Also as it was designed as a fire support/artillery unit I wanted to have maximum stability at all times, as well as the additional ground support to allow it to access areas with rough ground.You make a good point though, the six legs would be very power hungry.

It is designed mainly to engage targets to its front, although it does have multiple 20MM cannons on its sides to defend its flanks. For the most part it would be coordinated to act with smaller infantry units to prevent its being flanked.

The front four cannons and 20MM cannons are able to rotate both vertically and horizontally, while the missile pods and rear artillery cannons are able to rotate vertically. The rocket mortar tubes on the upper frame are, of course, fixed.You have a very good point though.